APA (7th ed.) Citation

Halstead, Barret, Caselli, & Orr. (1976). A closer look at prehistoric mammals. Hamish Hamilton.

Chicago Style (17th ed.) Citation

Halstead, Barret, Caselli, and Orr. A Closer Look at Prehistoric Mammals. London: Hamish Hamilton, 1976.

MLA (8th ed.) Citation

Halstead, et al. A Closer Look at Prehistoric Mammals. Hamish Hamilton, 1976.